Grouting type rotating steel pipe pile and construction method
阅读说明：本技术 一种灌浆式旋转钢管桩及施工方法 (Grouting type rotating steel pipe pile and construction method ) 是由 侯和涛 赵宇 李克凡 陈鹏 于 2019-10-14 设计创作，主要内容包括：本发明涉及一种灌浆式旋转钢管桩及施工方法,包括钢管,所述钢管的顶部设有桩头,所述桩头能够连接外部旋转驱动单元以驱动钢管旋转；所述钢管的底端设有钻头,所述钻头将钢管的底端封闭；所述钢管的侧壁设有多个灌浆孔,所述灌浆孔贯穿钢管的侧壁,所述灌浆孔能够连通桩头内腔、钢管内腔及钢管外部的空间。所述钢管的侧壁外部套设有叶片。所述桩头为管状结构,所述桩头的内孔为螺纹孔。所述灌浆孔均布设置于钢管的侧壁。本发明能够解决现有钢管桩在旋转下降过程中使得周围土体松动的问题,提高土体的摩擦承载能力,增加桩基础的稳定性及承载力。(The invention relates to a grouting type rotating steel pipe pile and a construction method, wherein the grouting type rotating steel pipe pile comprises a steel pipe, the top of the steel pipe is provided with a pile head, and the pile head can be connected with an external rotating driving unit to drive the steel pipe to rotate; the bottom end of the steel pipe is provided with a drill bit, and the drill bit seals the bottom end of the steel pipe; the lateral wall of steel pipe is equipped with a plurality of grout holes, the lateral wall of steel pipe is run through to the grout hole, the grout hole can communicate pile head inner chamber, steel pipe inner chamber and the outside space of steel pipe. And blades are sleeved outside the side wall of the steel pipe. The pile head is of a tubular structure, and an inner hole of the pile head is a threaded hole. The grouting holes are uniformly distributed in the side wall of the steel pipe. The invention can solve the problem that the surrounding soil body is loosened in the rotating and descending process of the existing steel pipe pile, improve the friction bearing capacity of the soil body and increase the stability and the bearing capacity of the pile foundation.)
1. The grouting type rotary steel pipe pile is characterized by comprising a steel pipe, wherein a pile head is arranged at the top of the steel pipe and can be connected with an external rotary driving unit to drive the steel pipe to rotate;
the bottom end of the steel pipe is provided with a drill bit, and the drill bit seals the bottom end of the steel pipe;
the lateral wall of steel pipe is equipped with a plurality of grout holes, the lateral wall of steel pipe is run through to the grout hole, the grout hole can communicate pile head inner chamber, steel pipe inner chamber and the outside space of steel pipe, the outside cover of lateral wall of steel pipe is equipped with the blade.
2. The grouting type rotary steel pipe pile according to claim 1, wherein the pile head is a tubular structure, and an inner hole of the pile head is a threaded hole.
3. The grouting type rotary steel pipe pile according to claim 1, wherein the grouting holes are uniformly distributed in the side wall of the steel pipe.
4. The grouting type rotary steel pipe pile according to claim 2, further comprising a sealing plate which can be mounted on the upper end of the pile head to seal the pile head, wherein a grouting opening is formed in the sealing plate.
5. The grouting type rotary steel pipe pile according to claim 4, further comprising an expansion plug and a grouting pipe, wherein the expansion plug is provided with an air cavity, the air cavity is communicated with an air pipe, the air pipe is communicated with an inflation device, one end of the grouting pipe penetrates through the middle of the expansion plug, and the other end of the grouting pipe can be connected with the grouting device to achieve grouting;
the expansion plug can stretch into the inner cavity of the steel pipe and divide the inner cavity of the steel pipe into a non-grouting section and a grouting section.
6. The grouting type rotary steel pipe pile according to claim 2, wherein a plurality of partition plates are arranged in the inner cavity of the steel pipe, the partition plates divide the inner cavity of the steel pipe into a plurality of grouting spaces, grouting holes are formed in the partition plates, and vertical axes of the grouting holes are overlapped.
7. A grouting type rotary steel pipe pile construction method using the grouting type rotary steel pipe pile according to any one of claims 1 to 3, characterized by comprising the steps of,
step 1, connecting a pile head with an external rotation driving unit, and driving a steel pipe to drill downwards to a set depth by using a drill bit;
step 2, removing the external rotation driving unit, plugging the upper end of the pile mouth by using a sealing plate, inserting one end of a grouting pipe into the grouting mouth, and connecting the other end of the grouting pipe with external grouting equipment;
step 3, injecting grout into the inner cavity of the steel pipe by using external grouting equipment;
step 4, after the inner cavity of the steel pipe is filled with grout, continuing grouting to enable the grout to diffuse from the grouting hole to a soil layer outside the steel pipe;
and 5, stopping grouting when the grouting slurry volume or grouting pressure reaches a set value, and pumping away the grouting pipe.
8. A grouting type rotary steel pipe pile construction method using the grouting type rotary steel pipe pile according to claim 5, comprising the steps of,
step 1, connecting a pile head with an external rotation driving unit, and driving a steel pipe to drill downwards to a set depth by using a drill bit;
step 2, removing the external rotation driving unit, placing the expansion plug into the inner cavity of the steel pipe after deflation and lowering to a set depth, inflating and expanding the expansion plug, forming a grouting section in the inner cavity of the steel pipe at the lower part of the expansion plug,
grouting the grouting section by using the grouting pipe, enabling the grout to flow out of the steel pipe from the grouting hole after the grouting section is filled with the grout, and stopping grouting when the grouting volume or grouting pressure meets the requirements;
step 3, moving the expansion plug upwards for a set distance after the expansion plug is deflated, then inflating the expansion plug, and repeating the grouting process in the step 2;
step 4, when the distance between the expansion plug and the pile head meets the set requirement, taking out the expansion plug from the inner cavity of the steel pipe;
the upper end of the pile mouth is sealed by using a sealing plate, and grout is injected into the pile head and the inner cavity of the steel pipe by using external grouting equipment of a grouting pipe;
step 5, after the inner cavity of the steel pipe is filled with grout, continuing grouting to enable the grout to diffuse from the grouting hole to a soil layer outside the steel pipe;
and 6, stopping grouting when the volume or the grouting pressure of the grouting slurry reaches a set value, and pumping away the grouting pipe.
9. A grouting type rotary steel pipe pile construction method using the grouting type rotary steel pipe pile according to claim 6, comprising the steps of,
step 1, connecting a pile head with an external rotation driving unit, and driving a steel pipe to drill downwards to a set depth by using a drill bit;
step 2, removing the external rotary driving unit, and enabling the lower end of the grouting pipe to extend into a grouting space closest to the drill bit;
step 3, injecting grout into the grouting space by using a grouting pipe, wherein the grouting pipe expands during grouting to completely seal a grouting hole;
after the current grouting space is filled with grout, continuing grouting to enable the grout to diffuse from the grouting hole to a soil layer outside the steel pipe;
and 4, stopping grouting when the size or grouting pressure of the grouting space where the tail end of the grouting pipe is located reaches a set value, drawing a distance away from the grouting pipe in the direction of the pile head to enable the tail end of the grouting pipe to be located in another grouting space, and repeating the step 3 until all the grouting spaces complete grouting.
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a grouting type rotary steel pipe pile and a construction method.
Background
In civil and architectural engineering, in order to improve the stability of a building and increase the bearing capacity of a foundation, the foundation of the building is generally a pile foundation, and foundation pile structures for buildings comprise steel pipe piles, concrete piles and cast-in-place piles.
The inventor has appreciated that the conventional cast-in-place piles and precast concrete piles are limited by site range, construction process and weather, and the progress is slow. Large construction equipment is required, and noise pollution and slurry pollution are generated.
The steel-pipe pile includes rotatory steel-pipe pile, and its atress form is similar with the end-bearing pile, and although the soil body under the blade and the soil body around the pile body also can provide corresponding bearing capacity, but can make the soil body not hard up on every side during the rotation, and the friction bearing capacity that leads to the soil body to provide diminishes, and the stability and the bearing capacity of pile foundation can receive the influence.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a grouting type rotary steel pipe pile and a construction method.
The invention aims to provide a grouting type rotary steel pipe pile, which solves the problem that the surrounding soil body is loosened in the rotary descending process of the existing steel pipe pile, improves the friction bearing capacity of the soil body, and increases the stability and the bearing capacity of a pile foundation.
A second object of the present invention is to provide a method of constructing a grouting type rotary steel pipe pile, which guides the construction of a grouting type rotary steel pipe pile having a small pile length.
A third object of the present invention is to provide a second grouting type rotary steel pipe pile construction method, which guides the construction of a grouting type rotary steel pipe pile having a large pile length, emphasizes the use of a movable expansion plug to realize sectional grouting in the pile length direction.
The fourth object of the present invention is to provide a third method for constructing a grouted rotary steel pipe pile, which guides the construction of a grouted rotary steel pipe pile having a large pile length, and focuses on the utilization of a partition structure to achieve sectional grouting in the pile length direction.
In order to achieve the purpose, the invention adopts the following technical scheme: a grouting type rotary steel pipe pile comprises a steel pipe, wherein a pile head is arranged at the top of the steel pipe and can be connected with an external rotary driving unit to drive the steel pipe to rotate; the bottom end of the steel pipe is provided with a drill bit, and the drill bit seals the bottom end of the steel pipe;
the lateral wall of steel pipe is equipped with a plurality of grout holes, the lateral wall of steel pipe is run through to the grout hole, the grout hole can communicate pile head inner chamber, steel pipe inner chamber and the outside space of steel pipe, the outside cover of lateral wall of steel pipe is equipped with the blade.
And (3) adding grouting holes on the side wall of the rotary steel pipe: compared with the method that the rotary steel pipe is directly used as a pile foundation, the slurry can reinforce a peripheral soil layer loosened due to rotation of the blades in the rotary steel pipe, so that the steel pipe, the concrete and the peripheral soil layer form a complete whole, and the structural stability and the bearing capacity of the steel pipe pile are improved.
Further, still include the board of sealing, the board of sealing can be installed in the upper end of pile head in order to realize the shutoff of pile head, be equipped with the slip casting mouth in the board of sealing.
By adopting the sealing plate structure, the sealing plate is connected with the pile head to seal the upper part of the pile head, so that pressure slurry can be conveniently injected into the pile head and the inner cavity of the steel pipe.
The grouting device further comprises an expansion plug and a grouting pipe, wherein the expansion plug is provided with an air cavity, the air cavity is communicated with an air pipe, the air pipe is communicated with an inflating device, one end of the grouting pipe penetrates through the middle part of the expansion plug, and the other end of the grouting pipe can be connected with the grouting device to realize grouting; the expansion plug can stretch into the inner cavity of the steel pipe and divide the inner cavity of the steel pipe into a non-grouting section and a grouting section.
The expansion plug is adopted to be matched with the grouting pipe for use, when the length of the steel pipe pile is large, the expansion plug is adopted to isolate the inner cavity of the steel pipe into a non-grouting section and a grouting section, segmented grouting is achieved, it can be guaranteed that slurry with a certain volume is spread outwards from a grouting hole in the inner cavity of each section of the steel pipe, and uniform reinforcement of soil outside the steel pipe is achieved.
Further, be equipped with a plurality of baffles in the inner chamber of steel pipe, the baffle divides into a plurality of slip casting spaces with the steel pipe inner chamber, be equipped with the injected hole in the baffle, the vertical axis coincidence of a plurality of injected hole. The grouting hole can be inserted into a grouting pipe, and the outer diameter of the grouting pipe is smaller than the inner diameter of the grouting hole.
Adopt the baffle structure, when the length of steel-pipe pile is great, the inflation when adopting baffle and slip casting pipe slip casting keeps apart into a plurality of slip casting spaces with the steel pipe inner chamber, realizes sectional grouting, can guarantee in each section steel pipe inner chamber, from the grout of the certain volume of grout hole outdiffusion, realizes the even reinforcement of the outside soil of steel pipe.
A construction method of a grouting type rotary steel pipe pile, which utilizes the grouting type rotary steel pipe pile, comprises the following steps,
and 5, stopping grouting when the grouting slurry volume or grouting pressure reaches a set value, and pumping away the grouting pipe.
A construction method of a grouting type rotary steel pipe pile utilizes the grouting type rotary steel pipe pile, and comprises the following steps:
grouting the grouting section by using the grouting pipe, enabling the grout to flow out of the steel pipe from the grouting hole after the grouting section is filled with the grout, and stopping grouting when the grouting volume or grouting pressure meets the requirements;
the upper end of the pile mouth is sealed by using a sealing plate, and grout is injected into the pile head and the inner cavity of the steel pipe by using external grouting equipment of a grouting pipe;
and 6, stopping grouting when the volume or the grouting pressure of the grouting slurry reaches a set value, and pumping away the grouting pipe.
A construction method of a grouting type rotating steel pipe pile utilizes the steel pipe cast-in-place pile and comprises the following steps:
after the grouting space is filled with grout, continuing grouting to enable the grout to diffuse from the grouting hole to a soil layer outside the steel pipe;
and 4, stopping grouting when the size or grouting pressure of the grouting space where the tail end of the grouting pipe is located reaches a set value, drawing a distance away from the grouting pipe in the direction of the pile head to enable the tail end of the grouting pipe to be located in another grouting space, and repeating the
The invention has the beneficial effects that:
1) and (3) adding grouting holes on the side wall of the rotary steel pipe: compared with the method that the rotary steel pipe is directly used as a pile foundation, the slurry can reinforce a peripheral soil layer loosened due to rotation of the blades in the rotary steel pipe, so that the steel pipe, the concrete and the peripheral soil layer form a complete whole, and the structural stability and the bearing capacity of the steel pipe pile are improved.
2) By adopting the sealing plate structure, the sealing plate is connected with the pile head to seal the upper part of the pile head, so that pressure slurry can be conveniently injected into the pile head and the inner cavity of the steel pipe.
3) The expansion plug is adopted to be matched with the grouting pipe for use, when the length of the steel pipe pile is large, the expansion plug is adopted to isolate the inner cavity of the steel pipe into a non-grouting section and a grouting section, segmented grouting is achieved, it can be guaranteed that slurry with a certain volume is spread outwards from a grouting hole in the inner cavity of each section of the steel pipe, and uniform reinforcement of soil outside the steel pipe is achieved.
4) Adopt the baffle structure, when the length of steel-pipe pile is great, the inflation when adopting baffle and slip casting pipe slip casting keeps apart into a plurality of slip casting spaces with the steel pipe inner chamber, realizes sectional grouting, can guarantee in each section steel pipe inner chamber, from the grout of the certain volume of grout hole outdiffusion, realizes the even reinforcement of the outside soil of steel pipe.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic view of the overall structure in
FIG. 2 is a schematic view of the structure of a drill bit according to
FIG. 3 is a schematic view of a blade according to
fig. 4 is a schematic structural view of a pile head in
fig. 5 is a schematic view of the structure of a pile head, a plugging plate and the like in
FIG. 6 is a schematic view showing the structure of a steel tube, an inflatable rubber stopper and the like in example 2 of the present invention;
fig. 7 is a schematic structural view of a separator in example 3 of the present invention.
In the figure: 1. pile head; 101. a threaded inner bore; 2. a blade; 3. a steel pipe; 4. grouting holes; 5. a drill bit; 501. cutting teeth; 6. a sealing plate; 7. a grouting port; 8. an expansion plug; 9. a grouting pipe; 10. a partition plate; 11. and (4) grouting holes.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide a preferred description of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Grout in this application refers to concrete grout or cement grout.